Surgical guide

ABSTRACT

A surgical device is provided which is formed of a pair of engageable members each having first and second channels which define respective first and second tunnels through the removably engaged members. Apertures through a proximal endwall provide a path for a cabled imaging component through said first tunnel to provide images of tissue surrounding the device, and an opening in the endwall of the paired members provides access to the second tunnel for a surgical blade for cutting tissue positioned in a gap between the paired members.

This application is a Continuing Application to U.S. patent applicationSer. No. 15/106,500 filed on Jun. 20, 2016, which claims priority toU.S. Provisional Patent Application Ser. No. 61/909,907 filed on Nov.27, 2013, and is inclusive thereof in its entirety by this referencethereto.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The disclosed device concerns surgical instruments employed in minimallyinvasive surgery. More particularly, the disclosed device and methodrelate to an apparatus and method employable as a guide for acooperatively configured blade, for cutting anatomic members, such asligaments, during minimally invasive surgical procedures.

2. Prior Art

Many surgical procedures on patients, for correction of an injury or aproblem brought about by disease, are performed using minimally invasivesurgery where surgical implements are positioned within the patient'sbody and guided by the surgeon using a video depiction of the surgicalsite communicated over a fiber optic line. Such procedures generallyrequire the surgeon to make incisions or cuts for removing, releasing,or relocating body tissue, for instance, surgery for ulnar nerve releasein the cubital tunnel or for a carpal tunnel release (also known ascarpal tunnel decompression surgery). In these and similar surgeries,the goal is to cut an adjacent ligament without damaging any proximatenerves, blood vessels, muscle or body tissue.

Such procedures generally include endoscopic or arthroscopic proceduresfor entering the patient and severing a ligament or other body tissuewhich is causing the patient harm or pain, with an anterograde knife,retrograde knife, or other blade as shown in U.S. Pat. No. 5,651,790.Herein lies a significant shortcoming in prior arts, as visibility forthe surgeon performing this delicate procedure is minimal since itconsists of a display on a video screen of the site which is captured bya small lens at the distal end of a fiber optic or other electronictransmission line.

The depicted surgical site is also shown in a somewhat unnaturalorientation and under artificial light projected from the same or acoaxial fiberoptic line. However, concurrently, the need for surgicalprecision and the surgeon's confidence in their movement to makeincisions and cut tissue with great accuracy is paramount.

Positioning of the blade or knife, which the surgeon will employ forsevering the ligament or other tissue causing the problem, requires theemployment of a guide. The guide is either inserted first to form apathway for the knife to the site of the internal surgery, or insertedconcurrently with the knife engaged within the guide. The guide providesa shield around the sharp portions of the blade during transition to thesurgical site.

However, conventional guides only provide a channel forming the bladepathway, on a single surface of a single elongated planar member. Thisconfiguration generally requires that the blade have a width shorterthan the adjacent sidewalls of the channel providing the pathway in theguide. However, the side of the blade which is not positioned adjacentto the surface of the channel, can contact body tissue when the blade istranslated within the channel since the channel only has three sides.Thus, damage can be done to the patient during such translation.

Additionally, conventional planar guides with channels for a cabledimaging component and surgical blades or knives can only form a pathwaythrough tissue the height of the sidewall of the guide. Body tissues,however, are quite pliable and incisions running though skin and fatlayers tend to collapse and impede translation of the guide intoposition within the body of the patient. Further, during suchtranslation the exposed side of the blade can cause incisions and otherdamage to body tissues since those tissues tend to bias or deformagainst the open channels formed in the guide.

As such, there is a continuing unmet need for an improved surgical guidedevice with formed pathways for both a surgical knife or blade, and fortranslation of optical cable of a cable imaging component employed forcommunicating the video depiction of the surgical site from the imagecapturing device. Such a device should provide the appropriate adjacentchannels for the surgical blade and optical cabled imaging component ina manner which prevents tissue contact against the blade and the opticalcable. Further, such a device should be employable by the user to widenor enlarge passages through which it needs to translate when needed.Still further, such a device should be capable of use with open channelswhen such are advantageous but reconfigurable to yield closed channels,or tunnels in the primary mode of use.

SUMMARY OF THE INVENTION

The device and method of employment herein disclosed and describedachieves the abovementioned goals for a surgical knife or blade guide,and remedies the noted shortcomings of prior art through the provisionof a significantly enhanced guide which configures two engageablemembers to form tunnels for both the blade or knife and the cabledimaging component running through the guide. Additionally provided areviewing apertures running through the tunnel formed for the opticalcable or cabled imaging component allowing translation therethrough ofthe lens end to view tissue located on both sides of the sidewallsforming the tunnel.

Using a novel means for removable engagement of both members, the deviceemploys a first member and a second member which are either slidably orrotationally engaged at respective proximal ends and which extend torespective distal ends. When placed in this adjacent position in thisengagement, a first channel formed into the first member is inregistered alignment with a first channel formed in the opposing secondmember to thereby form a first tunnel. This first tunnel is adapted toallow translation of a fiber optic or similar transmission cabledimaging component therethrough.

Additionally formed in the first tunnel, one or a plurality of aperturesformed in the channel wall of the first member and/or second memberprovide viewing apertures to view adjacent tissue or body structures onboth sides of the assembled device using the fiber optic componenttranslating through the formed tunnel.

Also formed into the surface of the first member is a second channelwhich is in a registered opposing position with a second channel formedin the second member when the two members are in rotational engagement.This second channel provides a covered pathway with which the knife orblade may translate and thereby be prevented from contact with bodytissues positioned on both sides of the engaged members.

A first means for engagement of the two members at proximal ends isprovided by a particularly preferred means for rotational engagement ofthe first and second members at their respective proximal ends.Currently, this engagement is provided by an axle projecting from bothsides of one of the two members which engages with a race formed on eachof a pair of curved members extending from the other of the two members.However, other means for rotational engagement can be used and areanticipated within the scope of this patent.

A second preferred means for engagement of the two members at theproximal ends of each, is a sliding engagement where cooperativeprojections on one member slidably engage into complimentary slots onthe other member. This is done using projections on one member sized andshaped to engage with a surrounding race on the other of the twomembers. This slidable engagement can yield a static attachment orrotational engagement depending on the shape of the sliding engagement.A sliding engagement of open ended hooked members on projecting axleswill yield such a rotational engagement.

In this registered engagement of the opposing members, it is preferredthat both are positioned substantially parallel to each other. Further,it is preferred that a small gap be maintained at the distal end of theengaged members to allow for viewing through the fiberoptic systemthrough the end.

When in a rotational engagement, the two members provide opposingsurfaces configured for compression between a thumb and opposing fingerof the user such as a surgeon. Compression of the opposing contactsurfaces results in an increase in separation distance of the two distalends, and thus can be used to widen an incision or to push an adjacentligament, blood vessel, or other body tissue away from the distal end ofthe assembled device.

It is an object of this invention to provide channels formed as tunnelsin surgical guides for fiber optic cables and surgical blades or knives.

It is a further object of this invention to provide such a guide whichis rotationally engaged at a proximal end to allow a separation at thedistal end through compression of the proximal end.

It is a further object of this invention to provide the two opposingmembers forming the device in a separable fashion which allows their usewithout the other opposing member.

These together with other objects and advantages which becomesubsequently apparent reside in the details of the construction andoperation of the disclosed surgical guide as more fully hereinafterdescribed and claimed, reference being had to the accompanying drawingsforming a part thereof, wherein like numerals refer to like partsthroughout.

With respect to the above summary, before explaining at least onepreferred embodiment of the herein disclosed ligament release surgicaltool in detail, it is to be understood that the disclosed surgical guideinvention is not limited in its application to the details ofconstruction and to the arrangement of the components in the followingdescription or illustrated in the drawings. The surgical guide hereindescribed is capable of other embodiments and of being practiced andcarried out in various ways which will be obvious to those skilled inthe art. Also, it is to be understood that the phraseology andterminology employed herein are for the purpose of description andshould not be regarded as limiting.

As such, those skilled in the art will appreciate that the conceptionupon which this disclosure is based may readily be utilized as a basisfor designing of other surgical guides and structures, and for othermethods and systems for carrying out the several purposes of the presentdisclosed device. It is important, therefore, that the claims beregarded as including such equivalent construction and methodologyinsofar as they do not depart from the spirit and scope of the presentinvention.

BRIEF DESCRIPTION OF DRAWING FIGURES

FIG. 1 shows two engageable components of one preferred mode of thedevice in an exposed view.

FIG. 2 is an isometric perspective view of the surgical guide device inan engaged mode with the two opposing members of FIG. 1, in a registeredengagement through a rotational engagement at respective proximal ends.

FIG. 3 depicts the device of FIG. 2, rotated to an open arrangementshowing opposing channels in each half which combine when closed todefine tunnels through the device to openings formed in the tapereddistal ends.

FIG. 4 depicts an isometric proximal end view of one member showing anaperture leading to a fiber optic channel and a second channel fortranslation of a surgical blade therethrough which when in registeredengagement forms tunnels.

FIG. 5 shows an isometric proximal end view of the opposing engageablemember and showing the fiberoptic or video channel and second channel.

FIG. 6 depicts an exploded view of two engageable opposing members ofanother favored mode of the device herein.

FIG. 7 shows a removably engaged mode of the two members of FIG. 6,showing them in a slidable engagement fixing both halves in registeredpositions to each other.

FIG. 8 provides a side view of the device if FIG. 7, but also applicableto the device of FIG. 2, showing the gap formed between the engagedmembers.

FIG. 9 shows a first side surface of one member of the pair from FIG. 6and showing the biased balls projecting and ready for engagement withdetents shown in the other half in FIG. 6.

FIG. 10 shows the device of FIG. 7, as it would be positioned in theas-used position inserted within a patient and having a formed channeltherein for translation of the blade.

FIG. 11 depicts the blade of FIG. 10 inserted with one half removed fromthe assembly so as to provide a view of both the channel formed for theblade and for the fiber optic or electronic cabled imaging component.

FIG. 12 shows the device as in FIG. 11 in an as-used position withtissue to be severed in a sandwiched position within the gap between thetwo members and both the blade and fiberoptic viewing component withcamera or lens inserted in respective channels.

DETAILED DESCRIPTION OF THE PREFERRED Embodiments of the Invention

Referring now to the drawings in FIGS. 1-11, where the same componentsare identified with the same numeral, there is seen in FIG. 1, one modeof the device 10 in a disassembled configuration. A first member 12 andsecond member 14 are engageable at respective proximal ends 11 of eachrespective member of the pair, employing means for removable engagementof the proximal end of the first member with the proximal end of thesecond member 14 to maintain a registered positioning of each member, inreceptive positions running parallel and with both aligned and runningalong a common axis.

In this assembled configuration, preferably running from adjacent theproximal end to the distal ends of the opposing members a gap 23 (FIG.8) is maintained by contact point between the opposing two members atpositions adjacent the proximal end, and a recessed edge of each memberextending away from the contact point. This gap 23 is very important toall modes of the device 10 in that it provides a protected cutting spacefor a sandwiched engagement of tissue to be cut by the device 10 whenengaged within the body of a patient.

The device 10 in all modes herein, achieves this assembledconfiguration, through a removable engagement at the respective proximalends of each of the first member 12 and second member 12. One preferredmeans for registered removable engagement or a disengageable connectionis shown in FIG. 2-3 wherein the first member 12 is a connection whichis rotationally engaged with a curved race 18 extending in a curvearound projecting members 15 extending from sides of the second member14. This engagement of the curved race 18 having a diameter acrossfacing portions of the curved race 18 slightly less than the diameter ofthe projecting members 15 maintains both members in a registeredpositioning with each other when closed as in FIG. 2, with both runningalong the same axis A, in removably fixed positions. It is thisremovable means for engagement of both respective side edges, of bothmembers to each other, which maintains the members aligned with eachother and with the axis A, during use in such removable engagement.

When the two members 12 and 14 are in the engaged configuration of FIGS.2-3 and 7-8, by a connection therebetween at their respective proximalends, they are in a registered engagement which is substantially fixedin the direction running along the axis A of both members such that theywill not slide in a direction along the axis A while engaged, as well asdeviate from this alignment laterally from the axis A. If the means forengagement or disengageable connection of the proximal ends is therotational engagement as shown in FIGS. 1-5, the two members are fixedand not translatable along the axis 23, while in the engaged positionseparated by the gap 22, but easily separable by sliding the projectingcurved race 18 through the gap 22 when the first member 12 with thecurved members 20 has its long axis perpendicular to that of the secondmember 14. Means for removable registered engagement or thedisengageable connection of opposing first member 12 and second member14 a which fixes the members from translating along the axis 23, couldalso be accomplished by a sliding engagement to a removably fixedpositioning, such as shown in FIGS. 6-8 and as discussed below.

As noted, the device 10 and method of employment when in the engagedmode of FIGS. 2 and 7, forms parallel tunnels for translation of a blade59 or knife (FIGS. 10-12) in one, and translation of a cabled imagingcomponent 63 or optical cable positionable in the other.

In both modes of the device 10 herein, employing the noted means forremovable engagement of the proximal ends of the first member 12 andsecond member 14, and positioning of the members adjacent as in FIG. 1or FIG. 7, a first channel 26 formed into the first member is inregistered alignment with a first channel 27 formed in the opposing orsecond member 14 to thereby form a first tunnel having said gap 23therebetween. This first tunnel 28 is adapted to allow translation of acabled imaging component 63 such as a fiber optic imaging component witha fiber optic cable with lens or similar cabled imaging component 63using a fiber optic or electronic cable engaged to a miniature camera orsimilar cabled imaging component providing a viewable image to the user.

In this first tunnel 28, one or a plurality of sequential apertures 29may be formed in the channel wall of the first member 12 and/or of thesecond member 14. These viewing apertures 29 are preferred in all modesas they provide a window through the device 10 whereby the electronic orfiber optic viewing component can capture images therethrough ofadjacent tissue or body structures on both sides of the assembled device10. This allows the surgeon or other user to view and ascertain thatbody tissue which should not to be cut, is positioned outside the gap 23between the two members and placed out of position for any cutting bythe knife or blade 59.

Also formed into the surface of the first member 12 is a second channel32 which is in a registered opposing position with a second channel 33formed into a facing surface of the second member 14. When the twomembers are adjacent and engaged at their proximal ends the adjacentrespective second channels form a second tunnel 36. This formed secondtunnel defines a pathway adjacent the center axis A of the device 10 inwhich a knife or blade 59 may translate safely and not cut body tissueoutside the gap. The second tunnel 36, within the gap 23 and separatedfrom tissue outside the gap 23 thereby provides a pathway whichseparates the moving knife or blade 59, from contact with body tissuesexterior to the gap 23.

In the engaged mode of FIGS. 1 and 7, where both members and bothrespective channels are in a registered opposing positioning, it is asnoted, preferred that both the first member 12 and second member 14 arepositioned with their long axis running substantially parallel to eachother and the axis A.

Additionally preferred is such a parallel positioning of the two membersin a removably fixed engagement to prevent translation, to form a gap 22at the distal end 41 of both members having a width “g” maintained atthe distal end 41 of the engaged members. Further, a curve 45 (FIG. 8)of the exposed distal surfaces of both members is preferred to providean inward taper of the distal end 41 of the assembled engaged device 10.Openings 47 may be placed at the distal termination of the channelscommunicating through the tapered portion as shown in FIGS. 2-3.

When in the engaged position of FIG. 1, in the rotational means forengagement of FIGS. 2-3, the two members have opposing surfaces 50positioned for a compression contact between a thumb and opposing fingerof the user such as a surgeon. This compression of the opposing contactsurfaces 50 results in a biased increase in separation distance of thetwo distal ends 41, and thus can be used as a means to widen an incisionin a passage through the body, or to push an adjacent ligament, bloodvessel, or other body tissue away from the distal end 41 of theassembled device 10.

FIG. 4 depicts a proximal end view of the device 10 in all modesdepicting the first member 12 of the device 10 showing an accessaperture 52 for communicating with the first tunnel 28, for translationof a cabled imaging component 63 and the second channel 32 forming halfof the second tunnel 36 for translation of a blade 59 or knifetherethrough as in FIG. 12.

FIG. 5 shows a typical view of the proximal end of the second member ofthe device 10 showing a second access aperture 52 for communicating thefiberoptic imaging device into the first tunnel 28 when the device is inthe closed position shown in FIG. 2 or 7.

FIG. 6 depicts an exploded view of two engageable opposing members ofanother favored mode of the device herein.

Shown in FIG. 6 is an exploded view of the first member 12 and secondmember 14 in another preferred mode of the device 10 wherein a slidingengagement at the proximal ends of both members forms a removableengagement of the members. The second member 14 has a proximal end 49shaped in a complimentary fashion to a recess 51 formed at the proximalend of the first member 12. Detents 53, are positioned in positionswithin the recess 51 to engage with biased projections 55 on a matingsurface of the second member 55 and the proximal end 49 thereof. Whenthe second member 14 is engaged as in FIG. 7, with the first member 12,the projections 55 slide into a removable engagement with the detents53. This engagement maintains both the first member 12 and second member14 in a fixed positioning running along the axis A. The projections canbe spring loaded to retract and project from the second member 14 suchthat force must be exerted in opposite directions to the first member 12and second member 14 to separate them from an engagement as in FIG. 7.Conversely, the spring loaded or biased projections 55 will when engagedin the detents 53 will maintain the fixed positioning of the firstmember 12 to the second member 14 along the axis A, and preventtranslation along the axis A by either when in the engaged position ofFIG. 7.

FIG. 7 as noted shows the device 10 in the engaged position where thefirst member 12 and second member 14 are held in fixed positions to eachother and prevented from translation relative to each other along theaxis A. As noted the members are held in this engaged positioning aslong as the projections 55 are engaged in the detents 53 or other meansfor engagement of the proximal ends of the members will do the same.

As noted, FIG. 8 provides a side view of the device 10 such as in FIG.7, but also applicable to the device of FIG. 2. Shown is the gap 23extending in between the engaged first member 12 and second member 14.

FIG. 9 shows a first side surface of the second member 14 of the pairfrom FIG. 6-7. As can be seen, the biased projections 55 are positionedand extending from the surface at the proximal end of the second memberand ready for engagement with the detents 53 in the first member 12 whenslid into the engagement shown in FIG. 7. Disengagement is possible bysimply employing sufficient force in opposite directions to each of thetwo members along the axis A until the projections translate into arecess housing them temporarily and dismount from the detents 53. Ofcourse re-engagement would be in the reverse.

FIG. 10 shows the device of FIG. 7, as it would be positioned in as-usedposition inserted within an incision through the skin of a patient. Inthe as-used position, the proximal ends of the engaged members are leftexposed, while all or a portion of the parallel first and second membersextend into the body of the patient. Shown also are the two accessapertures 52 providing access through the proximal ends for the fiberoptic cabled or electronic cable of a cabled imaging component 63 totranslate into the first tunnel 28 during use to provide a video displayof the tunnel 28 and surrounding body tissue through viewing through theviewing apertures 29 communicating between the first tunnel 28 andsurrounding tissue.

Additionally seen in FIG. 10 is the opening 37 communicating through theproximal ends and into the second tunnel 33 for translation of the blade59 into the engaged device 10 for cutting tissue 60, such as a tendonfor instance, which has been positioned in the gap 23 as shown in FIG.12. As noted above, the opening 37 is formed by positioning the twomembers in the engaged position of FIG. 2 or 7, wherein the secondchannel 32 formed in the first member is adjacent and aligned with thesecond channel 33 formed into a facing surface of the second member 14.

FIG. 11 depicts the blade 59 of FIG. 10 inserted into the device of FIG.10, except with the second member 14, removed from the assembly so as toprovide a view of the second channel formed into the first blade 12,providing a protected pathway for translation of the blade 59 to cutonly tissue 60 positioned within the gap 22.

FIG. 12 shows the device as in FIG. 10 in an as-used position withtissue 60 being severed where it has been positioned in a sandwichedposition within the gap 22 between the two members. Also shown is thefiberoptic or electronic cable for the cabled imaging component 63communicating through one of the access apertures 52 and into the firsttunnel 28 having the viewing apertures 29.

While all of the fundamental characteristics and features of theinvention have been shown and described herein, with reference toparticular embodiments thereof, a latitude of modification, variouschanges and substitutions are intended in the foregoing disclosure andit will be apparent that in some instances, some features of theinvention may be employed without a corresponding use of other featureswithout departing from the scope of the invention as set forth. Itshould also be understood that various substitutions, modifications, andvariations may be made by those skilled in the art without departingfrom the spirit or scope of the invention. Consequently, all suchmodifications and variations and substitutions are included within thescope of the invention as defined by the following claims.

What is claimed is:
 1. A surgical device, comprising: a first memberextending from a proximal end to a distal end and having a first surfaceopposite a second surface; a first channel defined by a first channelwall descending into said first surface and extending in-between saiddistal end and proximal end of said first member; a second channeldefined by a second channel wall descending into said first surfacerunning in-between said distal end and said proximal end, said secondchannel formed adjacent said first channel; a first side edge at saidproximal end communicating between said first surface and said secondsurface; a first aperture communicating through said first side edgewith said first channel, said aperture sized to accommodate translationof a cabled imaging component therethrough; at least one viewingaperture communicating between said first channel wall and said secondsurface; said viewing aperture configured for positioning of said cabledimaging component therein; said second channel communicating at a firstend through an opening in said side edge; said opening adapted fortranslation of a blade therethrough during a translation thereof intoand out of said second channel; wherein, with said surgical device uponan insertion into the body of a patient through an incision to anas-used positioning, said cabled imaging component is translatablethrough said first aperture into said first channel to capture an imagethrough said viewing aperture of areas surrounding said surgical devicetherefrom, and said second channel defines a guided translationalpathway for said blade; a second member extending from a proximal end toa distal end and having a first surface opposite a second surface; afirst channel defined by a first channel wall descending into said firstsurface of said second member, and extending in-between said distal endand proximal end of said second member; a second channel defined by asecond channel wall descending into said first surface of said secondmember and extending in-between said distal end and said proximal end ofsaid second member, said second channel formed in said second memberformed adjacent said first channel thereof; a second side edge at saidproximal end of said second member communicating between said firstsurface and said second surface thereof; a second aperture communicatingthrough said second side edge to said first channel of said secondmember, said second aperture sized to accommodate translation of saidcabled imaging component therethrough; said second channel formed insaid second member communicating through said second side edge; adisengageable cooperating connector engaging said first member andsecond member to form an assembled instrument, with respective firstsides of each of said first member and said second member facing eachother across a gap therebetween, said gap extending through opposingdistal ends of said first and second members; said first channel of saidfirst member in position directly across said gap from said firstchannel of said second member defining a first tunnel of said assembledinstrument; said second channel of said second member in positiondirectly across said gap from said second channel of said first memberdefining a second tunnel of said assembled instrument; said secondtunnel communicating through said second side edge and forming anopening for translation of said blade to said second tunnel; said secondaperture and said first aperture both providing individual separatepathways for said cabled imaging component to said first tunnel; saidsecond surface at said distal end of said second member, having acurved, said curve extending from a position on said second surfaceadjacent said distal end of said second member, to said distal end ofsaid second member, said curve on said first member and said curve onsaid second member providing a path through said incision for reducing aforce required for said insertion.
 2. The surgical device of claim 1additionally comprising: a stop positioned in said second channel, saidstop preventing translation of said blade past said distal end of saidfirst member.
 3. A surgical device, comprising: a first member extendingfrom a proximal end to a distal end and having a first surface oppositea second surface; a first channel defined by a first channel walldescending into said first surface and extending in-between said distalend and proximal end of said first member; a second channel defined by asecond channel wall descending into said first surface runningin-between said distal end and said proximal end, said second channelformed adjacent said first channel; a first side edge at said proximalend communicating between said first surface and said second surface; afirst aperture communicating through said first side edge with saidfirst channel, said aperture sized to accommodate translation of acabled imaging component therethrough; at least one viewing aperturecommunicating between said first channel wall and said second surface;said viewing aperture configured for positioning of said cabled imagingcomponent therein; said second channel communicating at a first endthrough an opening in said side edge; said opening adapted fortranslation of a blade therethrough during a translation thereof intoand out of said second channel; wherein, with said surgical device uponan insertion into the body of a patient through an incision to anas-used positioning, said cabled imaging component is translatablethrough said first aperture into said first channel to capture an imagethrough said viewing aperture of areas surrounding said surgical devicetherefrom, and said second channel defines a guided translationalpathway for said blade; a second member extending from a proximal end toa distal end and having a first surface opposite a second surface; afirst channel defined by a first channel wall descending into said firstsurface of said second member, and extending in-between said distal endand proximal end of said second member; a second channel defined by asecond channel wall descending into said first surface of said secondmember and extending in-between said distal end and said proximal end ofsaid second member, said second channel formed in said second memberformed adjacent said first channel thereof; a second side edge at saidproximal end of said second member communicating between said firstsurface and said second surface thereof; a second aperture communicatingthrough said second side edge to said first channel of said secondmember, said second aperture sized to accommodate translation of saidcabled imaging component therethrough; said second channel formed insaid second member communicating through said second side edge; adisengageable cooperating connector engaging said first member andsecond member to form an assembled instrument, with respective firstsides of each of said first member and said second member facing eachother across a gap therebetween, said gap extending through opposingdistal ends of said first and second members; said first channel of saidfirst member in position directly across said gap from said firstchannel of said second member defining a first tunnel of said assembledinstrument; said second channel of said second member in positiondirectly across said gap from said second channel of said first memberdefining a second tunnel of said assembled instrument; said secondtunnel communicating through said second side edge and forming anopening for translation of said blade to said second tunnel; said secondaperture and said first aperture both providing individual separatepathways for said cabled imaging component to said first tunnel; andsaid gap positionable around said chosen tissue to be severed by saidblade, whereby only said chosen tissue within said gap is severable andtissue surrounding said second tunnel with said surgical device in saidas-used positioning is protected from such severing.
 4. The surgicaldevice of claim 1 additionally comprising: said second surface at saiddistal end having a curved portion, said curved portion extending from aposition on said second surface adjacent said distal end, to said distalend; and said curved portion defining a curved surface portion of saidsecond surface, said curved surface portion adapted for sloped contactagainst tissue surrounding said incision at said distal end of saidsurgical device, where said sloped contact of said curved surfaceportion reduces a force required for said insertion.
 5. The surgicaldevice of claim 1 additionally comprising: a stop positioned in saidsecond channel, said stop preventing translation of said blade past saiddistal end of said first member.